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Re: [Qemu-devel] [PATCH] add text about how to use qemu-nbd with qemu
From: |
Michael Tokarev |
Subject: |
Re: [Qemu-devel] [PATCH] add text about how to use qemu-nbd with qemu |
Date: |
Tue, 03 Jul 2012 23:45:01 +0400 |
User-agent: |
Mozilla/5.0 (X11; Linux i686 on x86_64; rv:10.0.4) Gecko/20120510 Icedove/10.0.4 |
On 03.07.2012 15:05, address@hidden wrote:
> From: Wenchao Xia <address@hidden>
>
> Qemu system emulator reports only fails that make people confused
> about why, when it is invoked with nbd block device tring to connect
> qemu-nbd server. In fact qemu will try connect server for several
> times but server only accept one connect by default.
> I paid some times to find out why it fails. This patch add special
> text to explain how to use it in such case.
>
> Signed-off-by: Wenchao Xia <address@hidden>
> ---
> qemu-nbd.texi | 6 ++++++
> 1 files changed, 6 insertions(+), 0 deletions(-)
>
> diff --git a/qemu-nbd.texi b/qemu-nbd.texi
> index 6955d90..014040a 100644
> --- a/qemu-nbd.texi
> +++ b/qemu-nbd.texi
> @@ -44,6 +44,12 @@ Export QEMU disk image using NBD protocol.
> display this help and exit
> @item -V, --version
> output version information and exit
> +
> + Note: When qemu-nbd was used to export a disk that would be used by QEMU
> +block device, -t or --persistent must be set for that QEMU nbd client would
> try
> +connect more than one time. For eg:
> + qemu-nbd ./simple.img -p 10809 -t
> + qemu -hdb nbd:127.0.0.1:10809
It is not accurate.
qemu connect to nbd server not "several" but exactly two times by default.
The first connection it does (it need not be a separate connection
actually, and this, I'd say, a bug in qemu) in order to guess the format
of the internal structure inside - be it raw, or qcow, or anything else.
So, if you specify the format of the device explicitly, by using
format=raw, only single connection will be made.
/mjt
- Re: [Qemu-devel] [PATCH] add text about how to use qemu-nbd with qemu, (continued)
- Re: [Qemu-devel] [PATCH] add text about how to use qemu-nbd with qemu, Wayne Xia, 2012/07/03
- Re: [Qemu-devel] [PATCH] add text about how to use qemu-nbd with qemu, Wayne Xia, 2012/07/04
- Re: [Qemu-devel] [PATCH] add text about how to use qemu-nbd with qemu, Paolo Bonzini, 2012/07/05
- Re: [Qemu-devel] [PATCH] add text about how to use qemu-nbd with qemu, Michael Tokarev, 2012/07/05
- Re: [Qemu-devel] [PATCH] add text about how to use qemu-nbd with qemu, Paolo Bonzini, 2012/07/05
- Re: [Qemu-devel] [PATCH] add text about how to use qemu-nbd with qemu, Wayne Xia, 2012/07/06
- Re: [Qemu-devel] [PATCH] add text about how to use qemu-nbd with qemu, Wayne Xia, 2012/07/09
- Re: [Qemu-devel] [PATCH] add text about how to use qemu-nbd with qemu, Paolo Bonzini, 2012/07/09
Re: [Qemu-devel] [PATCH] add text about how to use qemu-nbd with qemu, Wei-Ren Chen, 2012/07/03
Re: [Qemu-devel] [PATCH] add text about how to use qemu-nbd with qemu,
Michael Tokarev <=